Question

which mineral property is being tested in the image below?
hardness test
fluorescence test
acid test
streak test

Explanation:

The image shows a mineral being tested with HCl (hydrochloric acid). An acid test involves applying acid (like HCl) to a mineral to observe if it reacts (e.g., fizzes due to carbonates reacting with the acid). A hardness test would involve scratching the mineral (e.g., with a fingernail, penny, etc.). A fluorescence test would require UV light to see if the mineral glows. A streak test involves rubbing the mineral on a streak plate to observe the color of the powder left behind. Since HCl is used, it's the acid test.

Answer:

Acid test